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Investment Securities Available For Sale, at Fair Value
 3 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Investment Securities Available For Sale, at Fair Value
4. Investment Securities Available For Sale, at Fair Value

The Company accounts for certain of its investment securities available for sale using the fair value election pursuant to ASC 825, where changes in fair value are recorded in unrealized gains (losses), net on the Company's condensed consolidated statements of operations. The Company also had investment securities available for sale where the fair value option had not been elected, which we refer to as CECL Securities. CECL Securities are reported at fair value with unrealized gains and losses recorded in other comprehensive income (loss) on the Company's condensed consolidated statements of comprehensive income (loss). The Company's investment securities available for sale consisted of the following as of March 31, 2024 and December 31, 2023, respectively (dollar amounts in thousands):

 March 31, 2024December 31, 2023
Amortized CostUnrealizedFair ValueAmortized CostUnrealizedFair Value
 GainsLossesGainsLosses
Fair Value Option
Agency RMBS
Fixed rate
Fannie Mae$1,152,811 $10,475 $(2,349)$1,160,937 $1,084,702 $15,902 $(723)$1,099,881 
Freddie Mac862,267 3,915 (4,463)861,719 676,436 5,679 (1,106)681,009 
Total Fixed rate
2,015,078 14,390 (6,812)2,022,656 1,761,138 21,581 (1,829)1,780,890 
Adjustable rate
Fannie Mae108,212 1,301 — 109,513 110,036 1,299 — 111,335 
Freddie Mac37,157 440 — 37,597 37,424 442 — 37,866 
Total Adjustable rate
145,369 1,741 — 147,110 147,460 1,741 — 149,201 
Interest-only
Ginnie Mae
62,222 — (14,503)47,719 52,623 6,813 (203)59,233 
Total Interest-only
62,222 — (14,503)47,719 52,623 6,813 (203)59,233 
Total Agency RMBS
2,222,669 16,131 (21,315)2,217,485 1,961,221 30,135 (2,032)1,989,324 
Non-Agency RMBS
21,447 6,443 (4,035)23,855 22,097 6,646 (4,281)24,462 
Total investment securities available for sale - fair value option
2,244,116 22,574 (25,350)2,241,340 1,983,318 36,781 (6,313)2,013,786 
CECL Securities
Non-Agency RMBS— — — — 35 — (4)31 
Total investment securities available for sale - CECL Securities
— — — — 35 — (4)31 
Total
$2,244,116 $22,574 $(25,350)$2,241,340 $1,983,353 $36,781 $(6,317)$2,013,817 

Accrued interest receivable for investment securities available for sale in the amount of $11.0 million and $9.8 million as of March 31, 2024 and December 31, 2023, respectively, is included in other assets on the Company's condensed consolidated balance sheets.

For the three months ended March 31, 2024 and 2023, the Company recognized $33.2 million in net unrealized losses and $0.9 million in net unrealized gains on investment securities available for sale accounted for under the fair value option, respectively.
The Company's investment securities available for sale pledged as collateral against interest rate swap agreements and repurchase agreements are included in investment securities available for sale on the accompanying condensed consolidated balance sheets with the fair value of securities pledged disclosed in Notes 10 and 12, respectively.

Realized Gain and Loss Activity

The Company did not sell investment securities during the three months ended March 31, 2024 and 2023. The Company recognized write-downs of non-Agency RMBS for a loss of $0.4 million for the three months ended March 31, 2024. The Company did not recognize any write-downs for the three months ended March 31, 2023.

Weighted Average Life

Actual maturities of our investment securities available for sale are generally shorter than stated contractual maturities (with contractual maturities up to 39 years), as they are affected by periodic payments and prepayments of principal on the underlying mortgages. As of March 31, 2024 and December 31, 2023, based on management’s estimates, the weighted average life of the Company’s investment securities available for sale portfolio was approximately 6.0 years and 6.9 years, respectively.

The following table sets forth the weighted average lives of our investment securities available for sale as of March 31, 2024 and December 31, 2023, respectively (dollar amounts in thousands):
Weighted Average LifeMarch 31, 2024December 31, 2023
0 to 5 years$374,823 $283,554 
Over 5 to 10 years1,863,538 1,727,269 
10+ years2,979 2,994 
Total$2,241,340 $2,013,817 

Unrealized Losses in Other Comprehensive Income (Loss)

The Company had no CECL Securities as of March 31, 2024. The Company evaluated its CECL Securities that were in an unrealized loss position as of December 31, 2023 and determined that no allowance for credit losses was necessary. The Company did not recognize credit losses for its CECL Securities through earnings for the three months ended March 31, 2024 and 2023.

The following table presents the Company's CECL Securities in an unrealized loss position with no credit losses reported, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2023, respectively (dollar amounts in thousands):

December 31, 2023Less than 12 monthsGreater than 12 monthsTotal
 Carrying
Value		Gross
Unrealized
Losses		Carrying
Value		Gross
Unrealized
Losses		Carrying
Value		Gross
Unrealized
Losses
Non-Agency RMBS$— $— $31 $(4)$31 $(4)
Total $— $— $31 $(4)$31 $(4)

Credit risk associated with non-Agency RMBS is regularly assessed as new information regarding the underlying collateral becomes available and based on updated estimates of cash flows generated by the underlying collateral. In performing its assessment, the Company considers past and expected future performance of the underlying collateral, including timing of expected future cash flows, prepayment rates, default rates, loss severities, delinquency rates, current levels of subordination, volatility of the security's fair value, temporary declines in liquidity for the asset class and interest rate changes since purchase.